Power shovel dipper



Sept.4, 1934. c, GM 1,972,652

POWER SHOVEL DIPPER Filed Dec. 14, 1953 Patented Sept. 4, 1934 UNITED STTES PATENT OFFICE 7 Claims.

The invention relates to dippers for power shovels and has reference particularly to improvements in dipper buckets which will increase the efficiency of the hinge connection for the door.

An object of the invention is to provide novel means which will prevent the building up of deposits of material that interfere with the free pivotal movement of the door, thereby improving the operation of the dipper door. More specically an object is to prevent the accumue lation in freezing weather of dirt and ice between the back of the dipper and the door hinge which accumulation has a tendency to prevent the door from opening or closing. This is especially troublesome in clippers used on electric shovels because with this type o shovel it is impossible to shake the dipper to cause the door to swing and thereby break the accumulation of frozen material.

A more specific object of the invention resides in the provision of an opening in the dipper back directly below the door hinge and which will act to discharge the material forced into the opening by the movement of the door hinge in swinging to open the door.

Another object resides in the provision of an opening in the dipper back directly below the door hinge and ribs or projections on the adjacent portion of the hinge, which will act to loosen the material as the ribs have movement by rotation of the hinge in opening and closing movements of the door and then discharge the loosened material through the opening.

With these and various other objects in View, the invention may consist of certain novel features of construction and operation as will be more fully described and particularly pointed out in the specification, drawing and claims appended hereto.

In the drawing which illustrates an embodiment of the device and wherein like reference characters are used to designate like parts- Figure 1 is an elevational View, parts being r shown in section, of a dipper bucket embodying improvements of the invention;

Figure 2 is a plan view of the dipper back, the door hinges being omitted to more clearly show the location of the openings; and

Figure 3 is a detail view of the hinge structure of a clipper bucket showing a modied form of the invention.

Referring more particularly to the drawing, the numeral 10 indicates in its entirety a dipper bucket of the usual construction having sides 11,

a dipper back 12 and door 13. The sides and back of the dipper are ribbed as at 14 and 15, respectively, for strengthening purposes, the dipper` back having in addition a plurality of lugs, certain of which serve to connect the dipper back with the clipper sticks, not shown, while others provide the hinge connection for joining the door 13 to the dipper. The lugs 16 located to the front of the dipper and lugs 18 located to the rear of the dipper are apertured as shown in Figure l, and receive studs which serve to connect the dipper sticks to the lugs and thus to the dipper back. The invention is particularly concerned with the hinge connection for the door 13, pivotally secured to the dipper back by means of the ribs 2O and the lugs 21.

The ribs 20 consist of a portion 22 to which the door 13 is secured as by riveting or otherwise, and an arcuate portion 23 terminating in a hinge abutment 24 apertured for receiving a pin 26 to pivotally unite the rib with the lugs 21. As the door 13 swings from the closed position shown in dotted lines in Figure 1 to the full line position, it will be observed that the hinge abutment 24 is eccentric with respect to the back of the clipper. Part of the contour of the hinge abutment is circular and part is eccentric with reference to the center of rotation, namely, the pin 26. In extreme open position therefore the eccentric portion 27 of the hinge abutment is spaced only a slight distance from the surface of the dipper back, whereas in closed position of the door this portion has been rotated and is now a considerable distance from the back of the dipper.

Accumulations of dirt and ore, and particularly in freezing weather of deposits of such material and ice on the Clipper back in the vicinity of the hinge abutment interferes with the free pivotal movement oi the ribs 20 and thus the door. To prevent the building up of these accumulations or deposits directly under the hinge connection for the door the invention provides an opening 30 in the dipper back substantially below the pivot pin 26 and between the pairs of lugs 21. These openings readily discharge deposits of material, thereby preventing such deposits from building up into hard frozen masses to interfere with the movement of the hinge abutment 24 whereby the door has at al1 times free pivotal movement. It is also to be noted that the eccentricity of the hinge abutments operates to positively force the deposits of material through the openings 30 and to secure the highest efficiency in the operation of the door the openings are located where they will be directly under the eccentric portion 27 of the hinge abutments when the door is open, as clearly shown in Figure 1.

In the modification of Figure 3 the periphery of the hinge abutment 24 is provided with a plurality of ribs or projections 31 which act, as the abutment rotates, to loosen the material that may become deposited on the back oi the dipper in the 'vicinity of the hinge connection. In the rotation of the hinge abutment the projections 3l are caused to move in a direction where they will not only loosen the material but will act to force the material into the opening 30. In this form of the invention the space between the abutment and the back of the dipper yis automatically cleaned and kept free of such deposits as would tend to interfere with the free pivotal movement of the door. Opening 30 is located with respect to the pivot pin 26, the same as described in Figure l, but the invention is not to be limited to a particular location of opening since deposits or accumulations of material will be prevented from building up in the vicinity of the hinge connection notwithstanding that the opening may be located to one side or the other f the vertical line passing through the pin 25 ordirectly under said pin. Also the invention is considered as covering a modification in which a plurality of openings -39 are formed in the backv of the dipper in a manner where their association with the abutment will prevent the building up of deposits by discharging of the accumulated material. l

It is to be understood that I do not wish to be limited by the exact embodiment of the device shown, which is merely by way of illustration and not limitation, Yas various and other forms of the invention will of course be apparent tothose skilled in the art 'withoutY departing from the spirit'of the invention or the vscope of the claims VI'claim:

vl. In a dipper bucket, a dipper back having lugs thereon, a door for the dipper, means connecting with the door and having a hinge portion ,pivotally secured to the lugs, and said back having an opening directly below the hinge con nection -to vprevent the accumulationfof matter which would interfere with the free pivotal movement of the door.

, 2. In a dipper bucket, Va dipperback having lugs thereon, a door for the dipper, means connecting Vwith the door andv having a 'hinge portion pivotally secured to the lugs, and said back g having an opening directly below the hinge connection, said opening discharging material forced i-nto the same by movement of the hinge portion. as the door opens and closes, thereby preventing 'the accumulation of ymaterial which would interfere with the free pivotal movement of the door. 1 Y f 3. In a dipper bucket, a dipper back having spaced lugs thereon, a door for the dipper, means connecting with the door and having a hinge abutment pivotally secured to the lugs and located between said lugs, a portion of the abutment being eccentric and having movement toward and away from the dipper back as said abutment rotates, and said back having an opening between the lugs and `located with respect to said eccentric portion to discharge material forced into the same, thereby preventing an accumulation of material as would interfere with the free pivotal movement of the door.

4. In a dipper bucket, a dipper back, a door for the dipper, supporting lugs on the back, means connecting with the door and having a hinge abutment pivotally secured to the lugs, said abutment being located between the lugs, and said Vback between the lugs and beneath the hinge connection being perforate to prevent the formation of deposits whichwould interfere with the free pivotal movement of the door.

5. In a dipper bucket, a dipper back, a door for the dipper, supporting lugs on the back, means connecting with the door and having a hinge abutment pivotally secured to the lugs, said abutment being located between the lugs, and said back between lthe lugs and beneath the hinge connection being open, whereby material collecting between the lugs -is discharged'.

6. In a dipper bucket, a dipper back, a door for the dipper, supporting lugs on the back, means connecting with the door and having a hinge abutment pivotally secured to the lugs, said abutment being located between the lugs, ribs on the periphery of the abutment, and said back having an opening between the lugs, whereby said ribs force material into the `open-A ing to prevent the building up of deposits which would interfere with the free pivotal movement of the door.

7. In a dipper bucket, a clipper back having spaced lugs thereon, a door for the dipper, means connecting the door and having a hinge abutment pivotally secured to the vlugs and located between said lugs, a portion of the abutment being eccentric and having movement toward and away from the dipper back as said abutment rotates, a plurality of projections formed onrthe periphery of the eccentric portion of said abutment and said back having an opening between the' lugs and located with respect to said eccentric portion to discharge the materials forced into the same thereby preventing an accumulation of material such as would interfere with the. free pivotal movement of the door. i

CLAUDE GILL. 

